35445: Acronis Backup 11.7/11.5: E-mail Notification Fails with "response : 535 5.7.3 Authentication unsuccessful"

Reconfigure the Exchange/mail server


An attempt to send an E-mail notification fails with the following error:

response : 535 5.7.3 Authentication unsuccessful


The Exchange/mail server is configured incorrectly.


Solution for Exchange Server 2007/2010/2013/2016

Open Exchange System Manager:

Configure settings:

Enable anonymous relaying for the Acronis Backup.

See also Petri Configuring Exchange 2007 as an Authenticated or Anonymous SMTP Relay.

Solution for Exchange Server 2003

Create a new domain user / administrator

Use this account to send E-mail notifications: